<template>
  <view>
    <view class="goods-list">
      <view v-for="(goods, index) in goodsList" :key="goods" @click="gotoDetail(goods)">
        <my-goods :goods="goods"></my-goods>
      </view>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      // 请求参数对象
      queryObj: {
        query: '',
        cid: '',
        pageNum: 1,
        pageSize: 10
      },
      goodsList: [],
      total: 0,
      // 节流阀
      isloading: false
    };
  },
  onLoad(options) {
    // 将页面跳转参数转存到queryObj
    this.queryObj.cid = options.cid || '';
    this.queryObj.query = options.query || '';
    this.getGoodsList();
  },
  methods: {
    // 获取商品列表数据的方法
    async getGoodsList(cb) {
      // 打开节流阀
      this.isloading = true;
      const { data: res } = await uni.$http.get('/api/public/v1/goods/search', this.queryObj);
      // 关闭节流阀
      this.isloading = false;
      // 只要数据请求完毕，就立即按需掉用 cb 回调函数
      cb && cb();
      if (res.meta.status !== 200) return uni.$showMsg();
      // 为数据赋值，通过展开运算符的形式，进行新旧数据拼接
      this.goodsList = [...this.goodsList, ...res.message.goods];
      this.total = res.message.total;
    },
    // 点击商品跳转详情页面
    gotoDetail(item) {
      uni.navigateTo({
        url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
      });
    }
  },
  // 触底事件
  onReachBottom() {
    const { pageNum, pageSize } = this.queryObj;
    // 判断是否还有下一页数据
    if (pageNum * pageSize >= this.total) return uni.$showMsg('数据加载完毕');
    if (this.isloading) return;
    // 让页码自增 +1
    this.queryObj.pageNum++;
    // 重新获取列表数据
    this.getGoodsList();
  },
  // 下拉刷新
  onPullDownRefresh() {
    // 1.重置关键数据
    this.queryObj.pageNum = 1;
    this.total = 0;
    this.isloading = false;
    this.goodsList = [];
    // 2.重新发起请求
    this.getGoodsList(() => uni.stopPullDownRefresh());
  }
};
</script>

<style lang="scss"></style>
